package org.bonorsoft.modules.system.shiro.authc.aop;

import cn.hutool.json.JSONUtil;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
import org.bonorsoft.common.api.vo.Result;
import org.bonorsoft.common.constant.CommonConstant;
import org.bonorsoft.common.util.ServletUtils;
import org.bonorsoft.common.util.oConvertUtils;
import org.bonorsoft.modules.system.shiro.authc.JwtToken;
import org.bonorsoft.modules.system.shiro.vo.DefContants;
import org.springframework.http.HttpStatus;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;

/**
 * @Description: 鉴权登录拦截器
 * @Author: WilliamYe
 * @Date: 2018/10/7
 **/
@Slf4j
public class JwtFilter extends BasicHttpAuthenticationFilter {

	/**
	 * 执行登录认证
	 *
	 * @param request
	 * @param response
	 * @param mappedValue
	 * @return
	 */
	@Override
	protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
		try {
			executeLogin(request, response);
			return true;
		} catch (Exception e) {
			throw new AuthenticationException(e.getMessage());
		}
	}

	/**
	 *
	 */
	@Override
	protected boolean executeLogin(ServletRequest request, ServletResponse response) throws AuthenticationException{
		HttpServletRequest httpServletRequest = (HttpServletRequest) request;
		//在request headers中添加X-Access-Token请求参数
		//String token = httpServletRequest.getHeader(DefContants.X_ACCESS_TOKEN);

		String parameter_token =  httpServletRequest.getParameter(DefContants.TOKEN);
		String header_token = httpServletRequest.getHeader(DefContants.X_ACCESS_TOKEN);
		String token = oConvertUtils.isNotEmpty(parameter_token) ? parameter_token : header_token;

		JwtToken jwtToken = new JwtToken(token);
		// 提交给realm进行登入，如果错误他会抛出异常并被捕获
		// 如果没有抛出异常则代表登入成功，返回true
		getSubject(request, response).login(jwtToken);
		return true;
	}

	/**
	 * 对跨域提供支持
	 */
	@Override
	protected boolean preHandle(ServletRequest request, ServletResponse response) throws IOException {
		HttpServletRequest httpServletRequest = (HttpServletRequest) request;
		HttpServletResponse httpServletResponse = (HttpServletResponse) response;
		httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
		httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
		httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
		// 跨域时会首先发送一个option请求，这里我们给option请求直接返回正常状态
		if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
			httpServletResponse.setStatus(HttpStatus.OK.value());
			return false;
		}
		try {
			super.preHandle(request, response);
		}catch (Exception e){
			//super.redirectToLogin(request, response);
			responseError(request, response,HttpStatus.INTERNAL_SERVER_ERROR.value(),e.getMessage());
			return false;
		}
		return true;
	}

	/**
	 * 将非法请求跳转到 /filterError/**中
	 */
	private void responseError(ServletRequest request, ServletResponse response, int code, String message) {
		try {
			if (ServletUtils.isAjaxRequest((HttpServletRequest) request))
			{
				response.setContentType("application/json;charset=UTF-8");
				response.getWriter().print(JSONUtil.toJsonStr(Result.error(message)));
			}else{
				HttpServletResponse httpServletResponse = (HttpServletResponse) response;
				//设置编码，否则中文字符在重定向时会变为空字符串
				message = URLEncoder.encode(message, "UTF-8");
				//如果有项目名称路径记得加上
				httpServletResponse.sendRedirect("/filterError/" + code + "/" + message);
			}
		} catch (IOException e) {
			log.error(e.getMessage());
		}
	}
}
